On May 6, 6:44*pm, Dave Doe wrote:
In article o_r_fairbairn-B758D1.12591306052009@70-3-168-
216.pools.spcsdns.net, says...





In article ,
*"Tim" wrote:

"Orval Fairbairn" wrote in message
news In article
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wrote:

On May 5, 1:06 pm, Scott Skylane wrote:
As an aside, the drag created by a windmilling propeller, i.e. one not
feathered and attached to a dead engine, creates as much drag as a flat
plate the same size as the area of the prop arc.

Nope. The blades cannot be everywhere at once, and so the area
affected is no larger than the blade area.

Dan

YES! In aeronautical engineering analysis, a windmilling prop is
considered to be a flat disk, with drag numbers to match. Feathering the
prop greatly reduces drag.

So you are saying if I loose power at high altitude in a fixed pitch prop
aircraft, like a Skyhawk, I will have less drag if I stop the prop, as
opposed to letting it windmill?

That is correct!

Please provide some evidence.

--
Duncan- Hide quoted text -

- Show quoted text -

Here is a URL to a thesis that addresses the question. The answer,
based on his evidence, is, it depends.

http://www.goshen.edu/physics/PropellerDrag/thesis.htm